- Mar 14 Thirty Years' War: Bavaria, Cologne, France and Sweden sign the Truce of Ulm
- Mar 25 Cape of Good Hope: tour ship Haerlem stranded in Tafel Bay
- May 11 Peter Stuyvesant arrives in New Amsterdam
- May 23 William II Prince of Orange sworn in as Stadtholder of Holland
- May 26 Alse Young becomes the first person executed as a witch in the American colonies, when she is hanged in Hartford, Connecticut
- May 26 Massachusetts disallows priest access to colony
- Jun 4 English Parliamentary army under Cornet George Joyce takes King Charles I as a prisoner during Second Civil War
- Jun 8 England parliament bans Christmas, Easter and Whitsun festivities, services and celebrations, including in the home, with fines for non-compliance - proves unpopular [1]
- Jul 7 People's uprising against high prices and Spanish rule in Naples
- Aug 8 The Irish Confederate Wars and Wars of the Three Kingdoms: Battle of Dungans Hill - English Parliamentary forces defeat Irish forces.
- Sep 1 French cardinal Mazarin & Duke of Modena sign treaty against Milan
- Nov 11 Massachusetts passes first compulsory school attendance law in the American colonies
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